The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 1990
Filed:
Apr. 19, 1989
Giuseppe Colombi, Roncole Verdi, IT;
Esam S.p.A., Parma, IT;
Abstract
A displacement type rotary air blower which, as a single-stage unit, comprises a single impeller (1) encased between a first half-shell (2) and a second half-shell (3), and in a two-stage version, two such impellers (1, 1a) in a casing formed from two outer half-shells (2) separated by an intermediate half-shell (10) positioned between the impellers; the second half-shell has a raised rim, creating a half-chamber (7) that coincides with the position of inlet and outlet ports incorporated into the first half-shell, the intermediate half-shell in the two-stage unit consisting in two such second half-shells matched symmetrically with their two rims combining to create a sealed chamber (8) the opposite bases of which are pierced to provide an outlet from the first stage and an inlet into the second, internally of the casing.